{"id":11600,"date":"2026-10-13T09:22:56","date_gmt":"2026-10-13T07:22:56","guid":{"rendered":"https:\/\/libolux.com\/blog\/how-high-to-hang-led-grow-lights\/"},"modified":"2026-10-13T09:41:13","modified_gmt":"2026-10-13T07:41:13","slug":"how-high-to-hang-led-grow-lights","status":"publish","type":"post","link":"https:\/\/libolux.com\/en\/blog\/how-high-to-hang-led-grow-lights\/","title":{"rendered":"How high to hang an LED grow light above your plants"},"content":{"rendered":"<div class=\"lbxb-answer\"><span class=\"lbxb-k\">Quick answer<\/span><\/p>\n<p>Height does not decide how much light you have: it decides <strong>how that light is spread<\/strong>. Inside a tent with reflective walls almost every photon ends up on the crop, so raising the fixture 20 cm does not take light away \u2014 it takes away the <strong>hot spot<\/strong>.<\/p>\n<p>As a starting point with a bar-style fixture: <strong>60\u201375 cm<\/strong> for cuttings and seedlings, <strong>40\u201360 cm<\/strong> in vegetative growth and <strong>30\u201345 cm<\/strong> in flower. But those centimetres only apply to the fixture they were measured with: the right height is the one that keeps PPFD inside the range the stage asks for.<\/p>\n<\/div>\n<div data-w=\"toc\"><\/div>\n<h2>Why centimetre tables get it wrong<\/h2>\n<p>Search for \u201chow high to hang my LED\u201d and you get tables with round numbers: 60 cm in veg, 40 in flower. The problem is that those centimetres never say which fixture they are talking about. A 120 W panel and a 1,000 W panel at the same height have nothing in common: the first falls short and the second burns.<\/p>\n<p>Height is not an input, it is the <strong>consequence<\/strong> of two inputs: the PPF your fixture delivers and the square metres you want to cover. With those two numbers the height follows; without them, any figure is borrowed from somebody else\u2019s panel.<\/p>\n<div class=\"lbxb-answer\"><span class=\"lbxb-k\">The sum<\/span><\/p>\n<p><strong>You do not pick the height, you solve for it<\/strong><\/p>\n<p>Fix the PPFD the stage asks for, look at your fixture\u2019s PPF and your area, then raise or lower until the point under the fixture lands inside that range. The tape measure is the tool, not the answer.<\/p>\n<\/div>\n<h2>What raising the fixture actually changes<\/h2>\n<p>Here is the part almost nobody mentions, and it changes how you set a room up. In a tent with reflective walls the photons that leave sideways are not lost: they bounce and land back on the crop. Which means the <strong>average PPFD over the area is practically the same at 30 cm as at 60 cm<\/strong>. What changes is the distribution.<\/p>\n<ul>\n<li><strong>Fixture low:<\/strong> a lot of light directly underneath and very little in the corners. The plants in the middle run ahead, the ones on the outside lag. In extreme cases, burnt tips and tacoing leaves in the centre while the rest coast along.<\/li>\n<li><strong>Fixture high:<\/strong> even spread, every plant in the same range, far less risk of burning. In exchange you lose usable growing height and, if the tent is not reflective, you really do lose light through the walls.<\/li>\n<\/ul>\n<p>Put another way: lowering the fixture does not give you more light, it gives you <strong>more inequality<\/strong>. And you pay for inequality in the corners, which is where half your plants are.<\/p>\n<p>Drag the slider and watch what happens to the centre and to the average. If the centre figure jumps and the average barely moves, you have the mechanism:<\/p>\n<div class=\"lbxb-w\" data-w=\"alt\"><\/div>\n<h2>Height by stage, and what really happens in each one<\/h2>\n<p>With the mechanism clear, the ranges make sense. They are not rules: they are where PPFD usually lands inside what the plant asks for, with a mid-range bar fixture.<\/p>\n<div class=\"lbxb-w\" data-w=\"ppfd\">\n<header>\n<p class=\"lbxb-t\">Light by growth stage<\/p>\n<p><span class=\"lbxb-k\">Reference values<\/span><\/header>\n<div class=\"lbxb-b\">\n<div class=\"lbxb-scroll\">\n<table class=\"lbxb-tbl\">\n<thead>\n<tr>\n<th>Stage<\/th>\n<th>PPFD<\/th>\n<th>Photoperiod<\/th>\n<th>DLI<\/th>\n<th>What for<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td class=\"lbxb-fase\">Cuttings and seedlings<\/td>\n<td data-ppfd=\"200\"><b>100 \u2013 300<\/b><\/td>\n<td data-h data-h0=\"18\">18&nbsp;h<\/td>\n<td data-dli><b>13.0<\/b><\/td>\n<td>Rooting and establishment without stressing the leaf<\/td>\n<\/tr>\n<tr>\n<td class=\"lbxb-fase\">Vegetative growth<\/td>\n<td data-ppfd=\"450\"><b>300 \u2013 600<\/b><\/td>\n<td data-h data-h0=\"18\">18&nbsp;h<\/td>\n<td data-dli><b>29.2<\/b><\/td>\n<td>Structure, short internodes and broad leaf<\/td>\n<\/tr>\n<tr>\n<td class=\"lbxb-fase\">Flowering without CO\u2082<\/td>\n<td data-ppfd=\"750\"><b>600 \u2013 900<\/b><\/td>\n<td data-h data-h0=\"12\">12&nbsp;h<\/td>\n<td data-dli><b>32.4<\/b><\/td>\n<td>Production: the range that decides the harvest<\/td>\n<\/tr>\n<tr>\n<td class=\"lbxb-fase\">Flowering with CO\u2082<\/td>\n<td data-ppfd=\"1000\"><b>900 \u2013 1,200<\/b><\/td>\n<td data-h data-h0=\"12\">12&nbsp;h<\/td>\n<td data-dli><b>43.2<\/b><\/td>\n<td>Only worth it with enrichment and controlled climate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"lbxb-note\">PPFD in \u00b5mol\/m\u00b2\/s and DLI in mol\/m\u00b2\/day. Switch the photoperiod with the buttons to see how DLI moves at the same intensity.<\/p>\n<\/div>\n<\/div>\n<p>For <strong>cuttings and seedlings<\/strong> you work high on purpose. The plant has little root and cannot sustain high transpiration; 100\u2013300 \u00b5mol\/m\u00b2\/s is plenty and anything extra shows up as stress before it shows up as growth.<\/p>\n<p>In <strong>vegetative growth<\/strong> height works as a shape control. Closer, the plant compacts and internodes shorten; further away, it stretches. If you want a short, wide plant, lowering the fixture is cheaper than pruning.<\/p>\n<p>In <strong>flower<\/strong> height matters most, because that is the stage that decides the yield and the only one where you can no longer touch the photoperiod. The goal here is 600\u2013900 \u00b5mol\/m\u00b2\/s <strong>over as much of the area as possible<\/strong>, not 1,200 in the middle and 400 in the corners.<\/p>\n<h2>Setting the height without a PAR meter<\/h2>\n<p>The right way is to measure with a PAR sensor. If you do not have one, there are three ways to get close:<\/p>\n<ul>\n<li><strong>Work it out.<\/strong> Average PPFD = fixture PPF \u00f7 square metres. If that already sits in the stage\u2019s range, your problem is not height, it is spread \u2014 and you fix it by raising until the centre stops spiking.<\/li>\n<li><strong>Read the plant, not the tape.<\/strong> Tacoing leaves (edges curling up into a canoe) and bleached tips on the plants in the middle while the rest look normal is localised over-intensity: raise it. Long internodes and plants reaching for the light: lower it.<\/li>\n<li><strong>Start high and come down.<\/strong> Dropping 5 cm every two or three days and watching is slow, but it has no expensive way back. Raising the fixture after you have burnt the tops does.<\/li>\n<\/ul>\n<div class=\"lbxb-answer\"><span class=\"lbxb-k\">The sum<\/span><\/p>\n<p><strong>The mistake of dimming to 50 % instead of raising the fixture<\/strong><\/p>\n<p>They are two different things. Dimming drops PPFD evenly across the whole area and saves you electricity. Raising the fixture spreads the same total better. If your centre is burnt and your corners are weak, dimming makes the corners worse; what you need is height.<\/p>\n<\/div>\n<h2>When the problem is not the height<\/h2>\n<p>There are three situations where moving the fixture fixes nothing, and it is worth spotting them before you spend a week pulling on ratchet hangers.<\/p>\n<ul>\n<li><strong>You do not have enough fixture.<\/strong> If PPF divided by square metres already lands below the range you are after, no height fixes that. You need more \u00b5mol\/s, not more rope.<\/li>\n<li><strong>You have too much fixture.<\/strong> A very large panel in a small tent forces you so high that you run out of growing height. Getting the size right is cleaner than compensating with distance.<\/li>\n<li><strong>One point source over a large area.<\/strong> Beyond roughly 2 m\u00b2, a single central fixture will always leave the corners poor however high you hang it. Two units spread better than one of twice the power.<\/li>\n<\/ul>\n<p>If you suspect you are in one of the three, the sum takes ten seconds with your own measurements:<\/p>\n<div class=\"lbxb-w\" data-w=\"calc\"><\/div>\n<h2>Mounting details that do matter<\/h2>\n<ul>\n<li><strong>Level it.<\/strong> A fixture 3 cm out of level end to end spreads noticeably worse. Two-rope ratchet hangers drift easily: check with a level, not by eye.<\/li>\n<li><strong>Keep it off the wall.<\/strong> A fixture pushed into a corner sends half its light into the fabric. Centred, the reflection works for you.<\/li>\n<li><strong>Leave air above it.<\/strong> Passively cooled fixtures rely on convection; pressing them against the tent roof raises heatsink temperature and shortens diode life.<\/li>\n<li><strong>Hang on ratchets, not zip ties.<\/strong> Not for comfort: so you can correct 5 cm in thirty seconds instead of taking the whole thing down.<\/li>\n<\/ul>\n<h2>The fixtures these figures are based on<\/h2>\n<p>The ranges in this article are worked out with 2.9 \u00b5mol\/J bar-style fixtures and a 120\u00b0 beam, which is the range we distribute. Every product sheet publishes PPF, efficacy, dimensions and diode count as a downloadable PDF:<\/p>\n<div class=\"lbxb-w\" data-w=\"prod\" data-ids=\"9000,9081,8730\" data-title=\"Three sizes that cover almost everything\"><\/div>\n<div class=\"lbxb-w lbxb-faq\" data-w=\"faq\">\n<header>\n<p class=\"lbxb-t\">Frequently asked questions<\/p>\n<p><span class=\"lbxb-k\">Real questions<\/span><\/header>\n<div class=\"lbxb-b\">\n<ol>\n<li>\n<h3><button type=\"button\" aria-expanded=\"false\">How high should a 600 W LED be hung?<\/button><\/h3>\n<div class=\"lbxb-a\">\n<div>\n<p>It depends on the area, not the wattage. A fixture of that order delivers around 1,800 \u00b5mol\/s: over 1.2 \u00d7 1.2 m that averages about 1,250 \u00b5mol\/m\u00b2\/s, too much for flowering without CO\u2082, so either dim it or use it over 2 m\u00b2. Over 1.5 \u00d7 1.5 m, 40\u201350 cm in flower is a reasonable starting point.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<h3><button type=\"button\" aria-expanded=\"false\">Does raising the fixture reduce the light the plant gets?<\/button><\/h3>\n<div class=\"lbxb-a\">\n<div>\n<p>Inside a tent with reflective walls, barely at all: the photons bounce and come back to the crop. What it reduces is the intensity peak directly underneath. In an open room with no reflective walls you really do lose light as you raise it, because those photons leave.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<h3><button type=\"button\" aria-expanded=\"false\">How do I know the fixture is too close?<\/button><\/h3>\n<div class=\"lbxb-a\">\n<div>\n<p>The signs show up on the plants in the middle and not on the rest: upper leaves curling up into a canoe, bleaching at the tips and stalled growth while the corner plants look normal. If it were a watering or nutrient problem it would hit the whole room evenly.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<h3><button type=\"button\" aria-expanded=\"false\">Is it better to lower the fixture or increase the power?<\/button><\/h3>\n<div class=\"lbxb-a\">\n<div>\n<p>If what you lack is average intensity, more power. If what you lack is intensity in one zone only, move the fixture or split into two units. Lowering the fixture to compensate for an undersized one concentrates light in the middle and leaves the corners just as poor.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<h3><button type=\"button\" aria-expanded=\"false\">Does the height change if I run CO\u2082?<\/button><\/h3>\n<div class=\"lbxb-a\">\n<div>\n<p>The target PPFD changes, and the height with it. With CO\u2082 enrichment it makes sense to work at 900\u20131,200 \u00b5mol\/m\u00b2\/s, which usually means lowering the fixture or using a bigger one. Without CO\u2082 and climate control, going above 900 is spend without return.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<li>\n<h3><button type=\"button\" aria-expanded=\"false\">What about a big room with several fixtures?<\/button><\/h3>\n<div class=\"lbxb-a\">\n<div>\n<p>The reference stops being height above the plant and becomes spacing between units. As a working rule, the distance between fixture centres should be similar to the height above the canopy: that way the cones overlap and you do not get dark strips between fixtures.<\/p>\n<\/div>\n<\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<div class=\"lbxb-w\">\n<header>\n<p class=\"lbxb-t\">Still running HPS?<\/p>\n<p><span class=\"lbxb-k\">Keep reading<\/span><\/header>\n<div class=\"lbxb-b\">\n<p>If you are coming from sodium, the switch works out in hard numbers: what each one delivers, what you save and how many months it takes to pay back.<\/p>\n<div class=\"lbxb-ctas\"><a class=\"lbxb-cta lbxb-cta--ghost\" href=\"https:\/\/libolux.com\/en\/blog\/led-vs-hps-grow-lights-compared\/\">See the comparison \u2192<\/a><\/div>\n<\/div>\n<\/div>\n<div class=\"lbxb-end\">\n<p class=\"lbxb-t\">Put your own measurements in and stop estimating<\/p>\n<p>The full calculator tells you which fixture fits your area, what average PPFD you will have and what the cycle will cost. With that, height stops being a question.<\/p>\n<div class=\"lbxb-ctas\"><a class=\"lbxb-cta\" href=\"https:\/\/libolux.com\/en\/calculator\/\">Open the calculator<\/a><a class=\"lbxb-cta lbxb-cta--ghost\" href=\"https:\/\/libolux.com\/en\/shop\/\">See the panels<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Height does not decide how much light you have: it decides how that light is spread. Inside a tent with reflective walls almost every photon ends up on the crop, so raising the fixture 20 cm does not take light away \u2014 it takes away the hot spot. As a starting point with a bar-style fixture: 60\u201375 cm<\/p>\n","protected":false},"author":1,"featured_media":8418,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[147],"tags":[],"class_list":{"0":"post-11600","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-growing-guides"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.8.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How high to hang an LED grow light - LIBOLUX<\/title>\n<meta name=\"description\" content=\"Why generic \u201c45 cm in flower\u201d tables get it wrong, what raising the fixture actually changes, and how to set the height from PPFD instead of by eye.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/libolux.com\/en\/blog\/how-high-to-hang-led-grow-lights\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How high to hang an LED grow light - 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